Nowadays one of the problems in Surabaya is rubbish with
each passing day worsen. It can be solved by building a sanitary
landfill in Benowo. Retaining wall is built to complete this
sanitary landfill as the structure to retain the surcharge of soil.
The height of the wall is about 5 meters from the surface with
depth of rock materials is about 20 meters. So it is very important
to do the alternative study of retaining wall design to get the most
effective and the cheapest design.
There are several steps to get the design. First we studied
the literature about the retaining wall. Then we choose some
design to be built and planed its dimension. After the dimension
is in compliance with its stability control we analyzed its cost.
There are three designs of retaining wall such as counterfort
concrete retaining wall concrete retaining wall with cantilever
arranged in steps and geotextile wall. For bearing capacity of
both of concrete retaining wall is ineligible use pile to recover it.
And for bearing capacity of geotextile wall is ineligible do some
soil improvement of sub grade. The conclusion of design calculation is concrete retaining
wall with cantilever arranged in steps modified with soldier pile
and batter pile is chosen because the construction cost is the
cheapest 6.692.635.450 rupiahs with the length of wall is about
145 meters.

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